This work was financially supported by National Natural Science Foundation of China (Nos. 50872001, 51072001, 51102072), National Science Research Foundation for Scholars Return from Overseas, Ministry of Education, China, Youth Science Research Foundation of Anhui University (No. 2009QN008A) and “211 Project” of Anhui University.
Optical and Wetting Properties of CuAlO2 Films Prepared by Radio Frequency Magnetron Sputtering
Article first published online: 22 NOV 2011
© 2011 The American Ceramic Society
Journal of the American Ceramic Society
Volume 95, Issue 1, pages 431–435, January 2012
How to Cite
Li, J., Wang, X., Shi, S., Song, X., Lv, J., Cui, J., Sun, Z. (2012), Optical and Wetting Properties of CuAlO2 Films Prepared by Radio Frequency Magnetron Sputtering. Journal of the American Ceramic Society, 95: 431–435. doi: 10.1111/j.1551-2916.2011.04943.x
- Issue published online: 3 JAN 2012
- Article first published online: 22 NOV 2011
- Manuscript Accepted: 10 OCT 2011
- Manuscript Received: 9 JUN 2011
- National Natural Science Foundation of China. Grant Numbers: 50872001, 51072001, 51102072
- National Science Research Foundation for Scholars Return from Overseas
The CuAlO2 films were prepared on glass and quartz substrates by radio frequency magnetron sputtering with a sintered target composed of Al(OH)3 and Cu2O powders. X-ray diffraction analyses reveal that the as-deposited films are amorphous structure and the as-annealed films are predominated by the CuAlO2 phase along with the Al2O3 phase. Scanning electron microscope (SEM) measurements indicate that grains grow up and surface becomes rougher as a result of increasing temperature. The optical studies show that annealing leads to the reduction of the average transmittance of the films from 60% to 40% for the visible range and the decrease of the fitted refractive index from 2.0 to 1.5. Direct band gaps confirmed by the transmittance and reflectance measurements are estimated to be 3.86 and 3.50 eV for as-deposited and as-annealed films, respectively. As increasing exposure time, water contact angles of the as-deposited films exposed under ultraviolet light source 365 nm or 254 nm decrease from 96.3° and 96.4° to 87.5° and 87.2°, respectively. The variation of contact angle can be attributed to the hydrophobic organic stains on the surface, surface roughness, the formation of Cu2+, and band gap variation of CuAlO2 film. The as-annealed film becomes hydrophilic and its water contact angle is 31.1°. The wetting property of CuAlO2 films is very important for the wide spread application of this material.